CN114353378A - Heat pump unit control method and device and heat pump unit - Google Patents
Heat pump unit control method and device and heat pump unit Download PDFInfo
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- CN114353378A CN114353378A CN202111531915.1A CN202111531915A CN114353378A CN 114353378 A CN114353378 A CN 114353378A CN 202111531915 A CN202111531915 A CN 202111531915A CN 114353378 A CN114353378 A CN 114353378A
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Abstract
The invention discloses a heat pump unit control method, a control device and a heat pump unit, wherein the method comprises the following steps: the unit operates to obtain the suction superheat degree, the economizer parameter and the exhaust parameter; judging whether the suction superheat degree reaches an initial target suction superheat degree; executing a first control process when the intake superheat does not reach the initial target intake superheat: adjusting the opening degree of the main electronic expansion valve according to the suction superheat degree and the initial target suction superheat degree; executing a second control process when the intake superheat reaches the initial target intake superheat: and adjusting the opening degree of the main electronic expansion valve and the opening degree of the auxiliary electronic expansion valve based on the economizer parameter and the exhaust parameter. By adopting the invention, the optimal control of the refrigerant flow in different flow paths of the heat pump unit and the optimal regulation and control of the unit efficiency can be realized.
Description
Technical Field
The invention belongs to the technical field of heat pump systems, and particularly relates to a heat pump unit control method, a control device and a heat pump unit.
Background
The heat pump unit is widely applied at present, and a refrigerant circulating system consisting of a compressor, a condenser, an electronic expansion valve, an economizer and an evaporator is utilized to realize the function of a heat pump.
The electronic expansion valve in the refrigerant circulating system of the existing heat pump unit generally comprises a main electronic expansion valve arranged in a main refrigerant circulating path and an auxiliary electronic expansion valve arranged in an auxiliary air supply path where an economizer is arranged, and the flow rates of refrigerants of the main path and the auxiliary path are adjusted by controlling the opening degree of the expansion valve, so that the performance requirement of the heat pump unit in operation is met.
In the prior art, a main electronic expansion valve and an auxiliary electronic expansion valve are mostly adopted for controlling the heat pump units respectively and independently. The expansion valves are controlled independently, when the opening of the expansion valve of the main path is too small, the flow of a channel is increased when the opening of the expansion valve of the auxiliary path is unchanged, and the risk that the liquid returns from the compressor through the auxiliary path exists; when the opening of the main expansion valve is too large, the flow of a channel of an auxiliary passage is reduced when the opening of the expansion valve is unchanged, and the problems of insufficient air supply of a compressor and reduced energy efficiency exist; and, the auxiliary expansion valve opening degree can also influence the exhaust temperature of the unit, easily leads to the unable steady operation of unit. Therefore, the conventional expansion valves are controlled independently from each other, so that the refrigerant flow in the main path and the refrigerant flow in the auxiliary path cannot be optimally controlled, and the optimal state of the unit efficiency cannot be achieved.
Disclosure of Invention
The invention aims to provide a heat pump unit control method and a heat pump unit control device, which are used for realizing the optimal control of the flow of refrigerants in different flow paths of a heat pump unit and the optimal regulation and control of the unit efficiency.
In order to achieve the purpose, the heat pump unit control method provided by the invention is realized by adopting the following technical scheme:
a control method of a heat pump unit including a main electronic expansion valve provided in a refrigerant circulation main circuit and an auxiliary electronic expansion valve provided in an air supply auxiliary circuit in which an economizer is provided, the method comprising:
the unit operates to obtain the suction superheat degree, the economizer parameter and the exhaust parameter;
judging whether the suction superheat degree reaches an initial target suction superheat degree;
executing a first control process when the intake superheat does not reach the initial target intake superheat: adjusting the opening degree of the main electronic expansion valve according to the suction superheat degree and the initial target suction superheat degree;
executing a second control process when the intake superheat reaches the initial target intake superheat: adjusting the opening degree of the main electronic expansion valve and the opening degree of the auxiliary electronic expansion valve based on the economizer parameter and the exhaust parameter;
the economizer parameter is the superheat degree of the economizer or the supercooling degree of the economizer; the exhaust parameter is exhaust superheat degree or exhaust temperature.
In a preferred embodiment of the present invention, adjusting the opening degree of the main electronic expansion valve and the opening degree of the auxiliary electronic expansion valve based on the economizer parameter and the exhaust parameter specifically includes:
comparing the economizer parameter with an initial target economizer parameter to obtain the state of the economizer parameter;
and determining whether to adjust the opening degree of the main electronic expansion valve and the opening degree of the auxiliary electronic expansion valve based on the exhaust parameter according to the state of the economizer parameter.
In a preferred embodiment of the present invention, determining whether to adjust the opening degree of the main electronic expansion valve and the opening degree of the auxiliary electronic expansion valve based on the exhaust parameter according to the state of the economizer parameter specifically includes:
when the economizer parameter is the economizer superheat degree, the initial target economizer parameter is an initial target economizer superheat degree; if the state of the economizer superheat degree is not higher than the initial target economizer superheat degree, executing a process of adjusting the opening degree of the main electronic expansion valve and the opening degree of the auxiliary electronic expansion valve based on the exhaust parameter;
when the economizer parameter is the economizer supercooling degree, the initial target economizer parameter is an initial target economizer supercooling degree; and if the state of the supercooling degree of the economizer is not lower than the supercooling degree of the initial target economizer, executing a process of adjusting the opening degree of the main electronic expansion valve and the opening degree of the auxiliary electronic expansion valve based on the exhaust parameter.
In a preferred embodiment thereof, adjusting the opening degree of the main electronic expansion valve and the opening degree of the auxiliary electronic expansion valve based on the economizer parameter and the exhaust parameter includes:
comparing the exhaust parameter with a target exhaust parameter when the economizer parameter reaches the initial target economizer parameter;
when the exhaust parameter is not higher than the target exhaust parameter, keeping the opening degree of the main electronic expansion valve unchanged, and adjusting the opening degree of the auxiliary electronic expansion valve according to the economizer parameter and the initial target economizer parameter;
and when the exhaust parameter is higher than the target exhaust parameter, increasing the initial target suction superheat degree to obtain an increased target suction superheat degree, adjusting the opening degree of the main electronic expansion valve according to the suction superheat degree and the increased target suction superheat degree, and adjusting the opening degree of the auxiliary electronic expansion valve according to the economizer parameter and the initial target economizer parameter.
In a preferred embodiment thereof, adjusting the opening degree of the main electronic expansion valve and the opening degree of the auxiliary electronic expansion valve based on the economizer parameter and the exhaust parameter includes:
when the degree of superheat of the economizer is lower than the initial target degree of superheat of the economizer, comparing the exhaust gas parameter with a target exhaust gas parameter;
when the exhaust parameter reaches the target exhaust parameter, keeping the opening degree of the main electronic expansion valve and the opening degree of the auxiliary electronic expansion valve unchanged;
when the exhaust parameter is higher than the target exhaust parameter, increasing the initial target suction superheat degree to obtain an increased target suction superheat degree, and adjusting the opening degree of the main electronic expansion valve according to the suction superheat degree and the increased target suction superheat degree; simultaneously reducing the superheat degree of the initial target economizer to obtain the reduced superheat degree of the target economizer, and adjusting the opening degree of the auxiliary electronic expansion valve according to the superheat degree of the economizer and the reduced superheat degree of the target economizer;
when the exhaust parameter is lower than the target exhaust parameter, keeping the opening degree of the main electronic expansion valve unchanged, simultaneously increasing the superheat degree of the initial target economizer to obtain the increased superheat degree of the target economizer, and adjusting the opening degree of the auxiliary electronic expansion valve according to the superheat degree of the economizer and the increased superheat degree of the target economizer;
comparing the exhaust parameter with the target exhaust parameter when the economizer supercooling degree is higher than the initial target economizer supercooling degree;
when the exhaust parameter reaches the target exhaust parameter, keeping the opening degree of the main electronic expansion valve and the opening degree of the auxiliary electronic expansion valve unchanged;
when the exhaust parameter is higher than the target exhaust parameter, adjusting the opening degree of the main electronic expansion valve according to the suction superheat degree and the increased target suction superheat degree; simultaneously increasing the supercooling degree of the initial target economizer to obtain the supercooling degree of the increased target economizer, and adjusting the opening degree of the auxiliary electronic expansion valve according to the supercooling degree of the economizer and the supercooling degree of the increased target economizer;
and when the exhaust parameter is lower than the target exhaust parameter, keeping the opening degree of the main electronic expansion valve unchanged, simultaneously reducing the supercooling degree of the initial target economizer to obtain the reduced supercooling degree of the target economizer, and adjusting the opening degree of the auxiliary electronic expansion valve according to the supercooling degree of the economizer and the reduced supercooling degree of the target economizer.
In a preferred embodiment thereof, adjusting the opening degree of the main electronic expansion valve and the opening degree of the auxiliary electronic expansion valve based on the economizer parameter and the exhaust parameter includes:
when the economizer superheat degree is higher than the initial target economizer superheat degree, increasing the initial target suction superheat degree to obtain an increased target suction superheat degree, and adjusting the opening degree of the main electronic expansion valve according to the suction superheat degree and the increased target suction superheat degree; reducing the superheat degree of the initial target economizer to obtain a reduced superheat degree of the target economizer, and adjusting the opening degree of the auxiliary electronic expansion valve according to the superheat degree of the economizer and the reduced superheat degree of the target economizer;
when the supercooling degree of the economizer is lower than the supercooling degree of the initial target economizer, increasing the initial target air suction superheat degree to obtain an increased target air suction superheat degree, and adjusting the opening degree of the main electronic expansion valve according to the air suction superheat degree and the increased target air suction superheat degree; and increasing the supercooling degree of the initial target economizer to obtain the increased supercooling degree of the target economizer, and adjusting the opening degree of the auxiliary electronic expansion valve according to the supercooling degree of the economizer and the increased supercooling degree of the target economizer.
In a preferred embodiment thereof, the method further comprises:
before the first control process and the second control process are executed, the opening degree of the main electronic expansion valve is adjusted to an initial main valve opening degree, and the opening degree of the auxiliary electronic expansion valve is adjusted to an initial auxiliary valve opening degree.
In a preferred embodiment thereof, the method further comprises:
and in the first control process, keeping the opening degree of the auxiliary electronic expansion valve as the initial auxiliary valve opening degree.
In order to achieve the purpose, the heat pump unit control device provided by the invention adopts the following technical scheme:
a heat pump unit control apparatus, the apparatus comprising:
an intake superheat degree acquisition unit for acquiring an intake superheat degree;
the economizer parameter acquisition unit is used for acquiring economizer parameters; the economizer parameter is the superheat degree of the economizer or the supercooling degree of the economizer;
the exhaust parameter acquisition unit is used for acquiring an exhaust parameter; the exhaust parameter is exhaust superheat degree or exhaust temperature;
an intake superheat degree determination unit for determining whether the intake superheat degree reaches an initial target intake superheat degree;
a first processing unit configured to execute a first control process when the degree of suction superheat does not reach the initial target degree of suction superheat: adjusting the opening degree of the main electronic expansion valve according to the suction superheat degree and the initial target suction superheat degree;
a second processing unit for executing a second control process when the intake superheat reaches the initial target intake superheat: and adjusting the opening degree of the main electronic expansion valve and the opening degree of the auxiliary electronic expansion valve based on the economizer parameter and the exhaust parameter.
The invention also provides a heat pump unit, which comprises a processor, a memory and a computer program stored on the memory, wherein the processor is configured to execute the computer program, so that the heat pump unit control method is realized.
Compared with the prior art, the invention has the advantages and positive effects that:
the heat pump unit control method and the control device provided by the invention firstly use the suction superheat degree as a rough adjustment parameter, adjust the opening degree of the main electronic expansion valve to enable the main electronic expansion valve to quickly reach a reasonable opening degree, then use the economizer parameter and the exhaust parameter as fine adjustment parameters, and finely adjust the opening degree of the main electronic expansion valve and the opening degree of the auxiliary electronic expansion valve; the main electronic expansion valve and the auxiliary electronic expansion valve are adjusted in a linkage mode through the suction superheat degree, the economizer parameter and the exhaust parameter, the coupling control of the opening degrees of the two expansion valves is achieved, the optimal control of the refrigerant flow of the refrigerant circulation main circuit and the refrigerant flow of the air supply auxiliary circuit is achieved, the refrigerant flows in different flow paths are guaranteed to reach an optimal state, the optimization of unit efficiency is achieved, and the stable and efficient operation of a unit is guaranteed.
Other features and advantages of the present invention will become more apparent from the following detailed description of the invention when taken in conjunction with the accompanying drawings.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic flow chart diagram illustrating a heat pump unit control method according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart of another embodiment of a heat pump unit control method of the present invention;
FIG. 3 is a schematic flow chart diagram illustrating a heat pump unit control method according to another embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a heat pump unit control apparatus according to an embodiment of the present invention;
FIG. 5 is a schematic structural diagram of an embodiment of the heat pump unit of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings and examples.
It should be noted that the technical solutions in the embodiments of the present invention may be combined with each other, but must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the protection scope of the present invention.
For a heat pump unit with a main electronic expansion valve and an auxiliary electronic expansion valve, the prior art generally adjusts the opening degrees of the two expansion valves in a mutually independent control manner, but the change of the opening degree of each expansion valve not only affects the refrigerant flow of a refrigerant branch where the expansion valve is located, but also affects the refrigerant flow in a refrigerant flow path of the whole heat pump unit, and the change of the refrigerant flow of the whole heat pump unit affects the refrigerant flow of each refrigerant branch, so that the mutually independent control manner of the expansion valves in different branches is difficult to obtain the optimized control of the flow of different branches. In order to solve the problems in the prior art, the invention creatively provides a method for adjusting the linkage of a main electronic expansion valve and an auxiliary electronic expansion valve of a heat pump unit, so as to realize the coupling control of the opening degrees of the two expansion valves and achieve the optimal control of the flow rates of different refrigerant flow paths.
Fig. 1 is a schematic flow chart of an embodiment of a heat pump unit control method according to the present invention, in which the heat pump unit includes a main electronic expansion valve disposed in a main refrigerant circuit and an auxiliary electronic expansion valve disposed in an auxiliary air supply circuit in which an economizer is disposed.
For a heat pump unit having a main electronic expansion valve and an auxiliary electronic expansion valve, the following procedure is adopted in this embodiment to adjust the opening degree of the electronic expansion valve.
Step 101: and acquiring the suction superheat degree, the economizer parameter and the exhaust parameter.
The method for acquiring the degree of superheat of the suction gas is realized by adopting the prior art. In one embodiment, the suction superheat is determined by the difference between the suction temperature of the heat pump unit and the suction side pressure saturation temperature. The suction temperature is detected by a temperature detection device arranged on the suction side of the compressor, and the suction side pressure saturation temperature is calculated by detecting the pressure on the suction side.
The parameter of the economizer can be the superheat degree of the economizer and can also be the supercooling degree of the economizer, and the obtaining methods are the prior art. In one embodiment, the economizer superheat is determined by a difference between an economizer sub-circuit outlet temperature and an economizer sub-circuit inlet temperature, which are detected by temperature detection devices provided at respective positions.
The exhaust parameter can be exhaust superheat degree or exhaust temperature, and the acquisition methods are all in the prior art. In one embodiment, the superheat of the exhaust gas is determined after correction based on the difference between the exhaust gas temperature and the leaving water temperature. The exhaust temperature and the outlet water temperature are detected by temperature detection devices arranged at corresponding positions.
Step 102: and judging whether the suction superheat degree reaches the initial target suction superheat degree or not. If yes, go to step 104; otherwise, step 103 is performed.
The initial target air suction superheat degree is a preset value, when the air suction superheat degree reaches the initial target air suction superheat degree, the corresponding opening degree of the main electronic expansion valve is a reasonable opening degree, and the heat pump unit can run relatively stably at the moment.
Step 103: when the suction superheat degree does not reach the initial target suction superheat degree, executing a first control process: the opening degree of the main electronic expansion valve is adjusted according to the suction superheat degree and the initial target suction superheat degree.
The suction superheat degree reaches the initial target suction superheat degree by adjusting the opening degree of the main electronic expansion valve. If the suction superheat has not reached the initial target suction superheat, the opening degree of the main electronic expansion valve is adjusted. Specifically, the opening degree of the main electronic expansion valve is adjusted according to the current suction superheat degree and the initial target suction superheat degree until the suction superheat degree reaches the initial target suction superheat degree, and the specific adjustment process is realized by adopting the prior art. In some embodiments, the opening degree of the main electronic expansion valve is adjusted in accordance with the difference between the suction superheat and the initial target suction superheat and/or the change speed of the suction superheat so that the suction superheat reaches the initial target suction superheat.
Step 104: when the suction superheat degree reaches the initial target suction superheat degree, executing a second control process: and adjusting the opening degree of the main electronic expansion valve and the opening degree of the auxiliary electronic expansion valve based on the economizer parameter and the exhaust parameter.
In the embodiment of fig. 1, the adjustment of the opening of the expansion valve uses a control strategy that is executed in two steps:
the method comprises the steps of firstly, executing a first control process, taking the suction superheat degree as a rough adjustment parameter, and roughly adjusting the opening degree of a main electronic expansion valve to enable the suction superheat degree to reach an initial target suction superheat degree, so that the main electronic expansion valve can quickly reach a reasonable opening degree, and the heat pump unit can be ensured to be in a relatively stable operation state in an express way. And secondly, after the suction superheat degree reaches the initial target suction superheat degree and the main electronic expansion valve reaches a relatively reasonable opening degree, executing a second control process, taking the economizer parameter and the exhaust parameter as fine adjustment parameters, finely adjusting the opening degree of the main electronic expansion valve and the opening degree of the auxiliary electronic expansion valve, and performing linkage adjustment on the main electronic expansion valve and the auxiliary electronic expansion valve to realize the coupling control of the opening degrees of the two expansion valves, realize the optimal control of the refrigerant flow of the refrigerant circulation main circuit and the refrigerant flow of the air supply auxiliary circuit, ensure that the refrigerant flow in different flow paths reaches an optimal state, further realize the optimization of the unit efficiency and ensure the stable and efficient operation of the unit.
Fig. 2 is a schematic flow chart showing another embodiment of the heat pump unit control method of the present invention, in which the heat pump unit includes a main electronic expansion valve disposed in the main refrigerant circuit and an auxiliary electronic expansion valve disposed in the auxiliary air supply circuit in which the economizer is disposed. For a heat pump unit having a main electronic expansion valve and an auxiliary electronic expansion valve, the following procedure is adopted in this embodiment to adjust the opening degree of the electronic expansion valve.
Step 201: the opening degree of the main electronic expansion valve is adjusted to the initial main valve opening degree, and the opening degree of the auxiliary electronic expansion valve is adjusted to the initial auxiliary valve opening degree.
The initial main valve opening and the initial auxiliary valve opening are preset values. After the heat pump unit is started, the main electronic expansion valve and the auxiliary electronic expansion valve are adjusted to corresponding initial opening degrees, and then subsequent adjustment is performed under the initial opening degrees, so that the adjustment efficiency is improved.
Step 202: and acquiring the suction superheat degree, the economizer parameter and the exhaust parameter.
The specific implementation of this step is described with reference to the embodiment of fig. 1.
Step 203: and judging whether the suction superheat degree reaches the initial target suction superheat degree or not. If yes, go to step 205; otherwise, step 204 is performed.
The initial target air suction superheat degree is a preset value, when the air suction superheat degree reaches the initial target air suction superheat degree, the corresponding opening degree of the main electronic expansion valve is a reasonable opening degree, and the heat pump unit can run relatively stably at the moment.
Step 204: executing a first control process: adjusting the opening degree of a main electronic expansion valve according to the suction superheat degree and the initial target suction superheat degree; and keeping the opening degree of the auxiliary electronic expansion valve as the initial auxiliary valve opening degree.
The adjustment of the opening degree of the main electronic expansion valve can be specifically referred to the corresponding description of the embodiment of fig. 1. And in the process of adjusting the opening of the main electronic expansion valve by adopting the air suction bone and meat amount, the opening of the auxiliary electronic expansion valve keeps the initial opening of the auxiliary valve unchanged.
Step 205: a second control process is executed. After the intake superheat reaches the initial target intake superheat, the second control process, specifically, the fine adjustment process of steps 206 and 207, is executed.
Step 206: and comparing the economizer parameter with the initial target economizer parameter to obtain the state of the economizer parameter.
The initial target economizer parameter is a preset value, when the economizer parameter reaches the initial target economizer parameter, the opening degree of the corresponding auxiliary electronic expansion valve is a reasonable opening degree, and the compressor can obtain reasonable air supplement.
In the second control process, whether the economizer of the heat pump unit effectively exchanges heat or not is judged based on the economizer parameter, and whether reasonable air supplement is provided for the compressor or not is judged. Specifically, the state of the economizer parameter reflected by the relationship of the economizer parameter to the initial target economizer parameter is used as a reference for the measurement.
Step 207: and determining whether to adjust the opening degree of the main electronic expansion valve and the opening degree of the auxiliary electronic expansion valve based on the exhaust parameter according to the state of the economizer parameter.
The exhaust parameter does not always participate in the adjustment of the opening degree of the main electronic expansion valve and the auxiliary electronic expansion valve, but whether the exhaust parameter is adopted to participate in the adjustment of the opening degree of the valves is determined according to the state of the economizer parameter.
In the embodiment, in the second control process, the state of the economizer parameter is judged firstly, the gas supply auxiliary circuit state of the economizer is judged based on the state of the economizer parameter, and then whether the exhaust parameter is used as the control parameter to participate in the adjustment of the valve opening degree is determined according to the state of the economizer parameter. By adopting the control strategy, the valve opening degree is finely adjusted based on the economizer parameters and finely adjusted based on the exhaust parameters, and then the valve opening degree is coarsely adjusted based on the suction superheat degree, so that the hierarchical coupling adjustment of the main electronic expansion valve and the auxiliary electronic expansion valve is realized, the adjustment precision and efficiency are further improved, the optimal control of the refrigerant flow of the refrigerant circulation main circuit and the refrigerant flow of the air supply auxiliary circuit is realized, the refrigerant flow in different flow paths is ensured to reach an optimal state, the optimization of the unit efficiency is further realized, and the stable and efficient operation of the unit is ensured.
In some embodiments, the initial target economizer parameter is an initial target economizer superheat when the economizer parameter is the economizer superheat. If the state of the superheat degree of the economizer is not higher than the superheat degree of the initial target economizer, the exhaust parameter participates in the adjustment of the valve opening degree, and the process of adjusting the opening degree of the main electronic expansion valve and the opening degree of the auxiliary electronic expansion valve based on the exhaust parameter is executed; otherwise, the exhaust variable does not take part in the adjustment of the valve opening.
In other embodiments, the initial target economizer parameter is an initial target economizer subcooling when the economizer parameter is an economizer subcooling. If the state of the supercooling degree of the economizer is not lower than the supercooling degree of the initial target economizer, the exhaust parameter participates in the adjustment of the opening degree of the valve, and the process of adjusting the opening degree of the main electronic expansion valve and the opening degree of the auxiliary electronic expansion valve based on the exhaust parameter is executed; otherwise, the exhaust variable does not take part in the adjustment of the valve opening.
Fig. 3 is a schematic flow chart showing a heat pump unit control method according to another embodiment of the present invention, and specifically, a specific flow chart of a second control process performed on a heat pump unit having a main electronic expansion valve and an auxiliary electronic expansion valve. In this embodiment, the opening degree of the main electronic expansion valve is first coarsely adjusted based on the suction superheat degree, which reaches the initial target suction superheat degree, by the method of the embodiment of fig. 1 and 2, and then the second control process is performed to adjust the opening degree of the main electronic expansion valve and the opening degree of the auxiliary electronic expansion valve based on the economizer parameter and the exhaust parameter. Also, in this embodiment, the economizer parameter is an economizer superheat degree, and the exhaust gas parameter is an exhaust gas superheat degree or an exhaust gas temperature.
As shown in fig. 3, this embodiment performs the second control process using the following process to achieve adjustment of the opening degrees of the main electronic expansion valve and the auxiliary electronic expansion valve.
Step 301: and comparing the superheat degree of the economizer with the initial target superheat degree of the economizer, determining that the superheat degree of the economizer is in a state lower than, reaches or is higher than the superheat degree of the defrosting target economizer, and then executing different controls according to different states.
Step 310: when the economizer superheat is in a state lower than the initial target economizer superheat, the control of steps 311 to 315 is executed. In this state, the exhaust gas variable participates in the adjustment of the opening of the two valves, and different adjustment control strategies are executed based on different states of the exhaust gas variable.
Step 311: and judging whether the exhaust parameter reaches the target exhaust parameter. If yes, go to step 312; otherwise, step 313 is performed.
The target exhaust parameter is a preset value, and if the exhaust parameter is the exhaust superheat degree, the target exhaust parameter is the target exhaust superheat degree; if the exhaust parameter is an exhaust temperature, the target exhaust parameter is a target exhaust temperature.
Step 312: keeping the opening degrees of the main electronic expansion valve and the auxiliary electronic expansion valve unchanged.
If the step 311 determines that the exhaust parameter reaches the target exhaust parameter, the opening degrees of the main electronic expansion valve and the auxiliary electronic expansion valve are kept unchanged, so as to prevent the exhaust temperature protection from affecting the normal operation of the system.
Step 313: and judging whether the exhaust parameter is higher than the target exhaust parameter. If yes, go to step 314; otherwise, step 315 is performed.
If the step 311 determines that the exhaust parameter does not reach the target exhaust parameter, it is further determined whether the exhaust parameter is higher than the target exhaust parameter, and different control is executed according to the determination result.
Step 314: increasing the initial target suction superheat degree, and adjusting the opening degree of a main electronic expansion valve; reducing the superheat degree of the initial target economizer and adjusting the opening degree of the auxiliary electronic expansion valve.
If the exhaust parameter is determined to be higher than the target exhaust parameter in step 313, the initial target intake superheat is increased to obtain an increased target intake superheat, and the opening degree of the main electronic expansion valve is adjusted according to the intake superheat and the increased target intake superheat, so that the opening degree of the main electronic expansion valve is reduced, and the exhaust temperature is prevented from being too high.
Meanwhile, the initial target economizer superheat degree is reduced, the reduced target economizer superheat degree is obtained, the opening degree of the auxiliary electronic expansion valve is adjusted according to the economizer superheat degree and the reduced target economizer superheat degree, the opening degree of the auxiliary electronic expansion valve is increased, and the compressor is rapidly cooled by increasing the flow of the air supply branch refrigerant.
Step 315: keeping the opening degree of the main electronic expansion valve unchanged; and increasing the superheat degree of the initial target economizer and adjusting the opening degree of the auxiliary electronic expansion valve.
If it is determined in step 313 that the exhaust parameter is not higher than the target exhaust parameter, the exhaust parameter is lower than the target exhaust parameter in combination with the determination in step 311. The opening degree of the main electronic expansion valve is kept unchanged, meanwhile, the initial target economizer superheat degree is increased, the increased target economizer superheat degree is obtained, the opening degree of the auxiliary electronic expansion valve is adjusted according to the economizer superheat degree and the increased target economizer superheat degree, the opening degree of the auxiliary electronic expansion valve is reduced, the flow of the air supply branch refrigerant is reduced, and the economizer superheat degree reaches the larger superheat degree.
Step 320: when the economizer superheat degree is in a state of reaching the initial target economizer superheat degree, the control process of step 321 to step 323 is executed. In this state, the exhaust gas variable also participates in the adjustment of the opening of the two valves, and different adjustment control strategies are executed based on different states of the exhaust gas variable.
Step 321: and judging whether the exhaust parameter is higher than the target exhaust parameter. If yes, go to step 322; otherwise, step 323 is performed.
Step 322: increasing the initial target suction superheat degree, and adjusting the opening degree of a main electronic expansion valve; and adjusting the opening degree of the auxiliary electronic expansion valve according to the superheat degree of the initial target economizer.
If it is determined in step 321 that the exhaust parameter is higher than the target exhaust parameter, the initial target suction superheat degree is increased to obtain an increased target suction superheat degree, and the opening degree of the main electronic expansion valve is adjusted according to the suction superheat degree and the increased target suction superheat degree, so that the opening degree of the main electronic expansion valve is reduced, and the exhaust temperature is prevented from being too high. Meanwhile, since the superheat degree of the economizer in step 320 has reached the superheat degree of the initial target economizer, the opening degree of the auxiliary electronic expansion valve is adjusted according to the economizer parameter and the superheat degree of the initial target economizer without changing the superheat degree of the initial target economizer, that is, the opening degree of the auxiliary electronic expansion valve is automatically adjusted according to the superheat degree of the initial target economizer. At the moment, the system capacity of the heat pump unit reaches the optimal state within the normal operation range.
Step 323: keeping the opening degree of the main electronic expansion valve unchanged; and adjusting the opening degree of the auxiliary electronic expansion valve according to the superheat degree of the initial target economizer.
If the exhaust parameter is determined not to be higher than the target exhaust parameter in step 321, the opening degree of the main electronic expansion valve is kept unchanged, and the opening degree of the auxiliary electronic expansion valve is adjusted according to the superheat degree of the economizer and the superheat degree of the initial target economizer, that is, the opening degree of the auxiliary electronic expansion valve is automatically adjusted according to the superheat degree of the initial target economizer.
Step 330: when the economizer superheat is in a state higher than the initial target economizer superheat, the control of step 331 is executed.
Step 331: increasing the initial target suction superheat degree, and adjusting the opening degree of a main electronic expansion valve; reducing the superheat degree of the initial target economizer and adjusting the opening degree of the auxiliary electronic expansion valve.
In the state that the degree of superheat of the economizer is higher than the initial target degree of superheat of the economizer, the adjustment of the opening degree of the two valves is carried out without considering the influence of the exhaust gas parameter. Specifically, the initial target suction superheat degree is increased to obtain an increased target suction superheat degree, and the opening degree of the main electronic expansion valve is adjusted according to the suction superheat degree and the increased target suction superheat degree, so that the opening degree of the main electronic expansion valve is reduced. Meanwhile, the initial target economizer superheat degree is reduced, the reduced target economizer superheat degree is obtained, the opening degree of the auxiliary electronic expansion valve is adjusted according to the economizer superheat degree and the reduced target economizer superheat degree, the opening degree of the auxiliary electronic expansion valve is increased, the air supplement branch refrigerant flow is increased, and the heat exchange temperature difference of the economizer is reduced.
It should be understood that the above process is a control process of one control cycle, and the above process is performed in a cycle during the whole operation of the heat pump unit.
The process is described with the economizer superheat as the economizer parameter, which in other embodiments may also be the economizer subcooling. When the economizer subcooling is used as the economizer parameter, some of the steps in fig. 3 are adjusted. The method comprises the following specific steps:
when the supercooling degree of the economizer is in a state higher than the supercooling degree of the initial target economizer, the exhaust parameter participates in the adjustment of the opening degree of the two valves, and different adjustment control strategies are executed based on different states of the exhaust parameter. Specifically, the exhaust parameter is first compared with a target exhaust parameter, and different control is executed according to the comparison result. And when the exhaust parameter reaches the target exhaust parameter, keeping the opening degree of the electronic expansion valve and the opening degree of the auxiliary electronic expansion valve unchanged. When the exhaust parameter is higher than the target exhaust parameter, adjusting the opening degree of the main electronic expansion valve according to the suction superheat degree and the increased target suction superheat degree; and simultaneously increasing the supercooling degree of the initial target economizer to obtain the increased supercooling degree of the target economizer, and adjusting the opening degree of the auxiliary electronic expansion valve according to the supercooling degree of the economizer and the increased supercooling degree of the target economizer. And when the exhaust parameter is lower than the target exhaust parameter, keeping the opening degree of the main electronic expansion valve unchanged, simultaneously reducing the supercooling degree of the initial target economizer to obtain the reduced supercooling degree of the target economizer, and adjusting the opening degree of the auxiliary electronic expansion valve according to the supercooling degree of the economizer and the reduced supercooling degree of the target economizer.
When the supercooling degree of the economizer reaches the initial target supercooling degree of the economizer, the exhaust parameter participates in the adjustment of the opening degree of the two valves, and different adjustment control strategies are executed based on different states of the exhaust parameter. Specifically, when the exhaust parameter is higher than the target exhaust parameter, the initial target air suction superheat degree is increased, and the opening degree of a main electronic expansion valve is adjusted; meanwhile, the opening degree of the auxiliary electronic expansion valve is adjusted according to the supercooling degree of the initial target economizer. And when the exhaust parameter is not higher than the target exhaust parameter, keeping the opening degree of the main electronic expansion valve unchanged, and adjusting the opening degree of the auxiliary electronic expansion valve according to the supercooling degree of the initial target economizer.
When the supercooling degree of the economizer is higher than the initial target supercooling degree of the economizer, the opening degrees of the two valves are adjusted without considering the influence of the exhaust gas parameter. Specifically, the initial target suction superheat degree is increased to obtain an increased target suction superheat degree, and the opening degree of the main electronic expansion valve is adjusted according to the suction superheat degree and the increased target suction superheat degree, so that the opening degree of the main electronic expansion valve is reduced. Meanwhile, the supercooling degree of the initial target economizer is increased to obtain the increased supercooling degree of the target economizer, and the opening degree of the auxiliary electronic expansion valve is adjusted according to the supercooling degree of the economizer and the increased supercooling degree of the target economizer.
Fig. 4 is a schematic structural diagram of a heat pump unit control device according to an embodiment of the present invention. In this embodiment, the heat pump unit includes a main electronic expansion valve provided in the main refrigerant cycle path and an auxiliary electronic expansion valve provided in the auxiliary air supply path in which the economizer is provided. The structural units included in the heat pump unit control device, the functions of the structural units and the relationship among the structural units are described in detail as follows:
the heat pump set control device comprises:
and an intake superheat acquisition unit 41 for acquiring an intake superheat.
An economizer parameter acquiring unit 42 for acquiring an economizer parameter. Wherein the economizer parameter is the superheat degree of the economizer or the supercooling degree of the economizer.
An exhaust parameter acquiring unit 43 for acquiring an exhaust parameter. Wherein the exhaust parameter is exhaust superheat degree or exhaust temperature.
And an intake superheat determination unit 44 for determining whether or not the intake superheat acquired by the intake superheat acquisition unit 41 has reached the initial target intake superheat.
A first processing unit 45 for executing a first control process when the intake superheat degree determination unit 44 outputs that the intake superheat degree does not reach the initial target intake superheat degree: the opening degree of the main electronic expansion valve is adjusted based on the suction superheat degree acquired by the suction superheat degree acquisition unit 41 and the initial target suction superheat degree.
A second processing unit 46 for executing a second control process when the output result of the intake superheat determination unit 44 is that the intake superheat reaches the initial target intake superheat: the opening degree of the main electronic expansion valve and the opening degree of the auxiliary electronic expansion valve are adjusted based on the economizer parameter acquired by the economizer parameter acquisition unit 42 and the exhaust parameter acquired by the exhaust parameter acquisition unit 43.
The control device with the structure runs corresponding software programs to execute corresponding functions, and controls the heat pump unit according to the heat pump unit control method embodiment and the process of the preferred embodiment of the heat pump unit control method embodiment shown in the figures 1 to 3, so that the corresponding technical effects of the method embodiment are achieved.
Fig. 5 shows a schematic structural diagram of an embodiment of the heat pump unit of the present invention. The heat pump unit comprises a processor 51, a memory 52 and a computer program 521 stored in the memory 52, wherein the processor 51 is configured to execute the computer program 521, so as to implement the control method of the heat pump unit control method embodiments and the preferred embodiments thereof shown in fig. 1 to 3, and to implement the technical effects of the corresponding embodiments.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions.
Claims (10)
1. A heat pump unit control method, the heat pump unit includes setting up the main electronic expansion valve in the refrigerant cycle main road and setting up the auxiliary electronic expansion valve in the tonifying qi auxiliary road where the economic device locates, characterized by that, the said method includes:
the unit operates to obtain the suction superheat degree, the economizer parameter and the exhaust parameter;
judging whether the suction superheat degree reaches an initial target suction superheat degree;
executing a first control process when the intake superheat does not reach the initial target intake superheat: adjusting the opening degree of the main electronic expansion valve according to the suction superheat degree and the initial target suction superheat degree;
executing a second control process when the intake superheat reaches the initial target intake superheat: adjusting the opening degree of the main electronic expansion valve and the opening degree of the auxiliary electronic expansion valve based on the economizer parameter and the exhaust parameter;
the economizer parameter is the superheat degree of the economizer or the supercooling degree of the economizer; the exhaust parameter is exhaust superheat degree or exhaust temperature.
2. The heat pump unit control method according to claim 1, wherein adjusting the opening degree of the main electronic expansion valve and the opening degree of the auxiliary electronic expansion valve based on the economizer parameter and the exhaust parameter specifically comprises:
comparing the economizer parameter with an initial target economizer parameter to obtain the state of the economizer parameter;
and determining whether to adjust the opening degree of the main electronic expansion valve and the opening degree of the auxiliary electronic expansion valve based on the exhaust parameter according to the state of the economizer parameter.
3. The heat pump unit control method according to claim 2, wherein determining whether to adjust the opening degree of the main electronic expansion valve and the opening degree of the auxiliary electronic expansion valve based on the exhaust parameter according to the state of the economizer parameter specifically comprises:
when the economizer parameter is the economizer superheat degree, the initial target economizer parameter is an initial target economizer superheat degree; if the state of the economizer superheat degree is not higher than the initial target economizer superheat degree, executing a process of adjusting the opening degree of the main electronic expansion valve and the opening degree of the auxiliary electronic expansion valve based on the exhaust parameter;
when the economizer parameter is the economizer supercooling degree, the initial target economizer parameter is an initial target economizer supercooling degree; and if the state of the supercooling degree of the economizer is not lower than the supercooling degree of the initial target economizer, executing a process of adjusting the opening degree of the main electronic expansion valve and the opening degree of the auxiliary electronic expansion valve based on the exhaust parameter.
4. The heat pump unit control method of claim 3, wherein adjusting the opening of the main electronic expansion valve and the opening of the auxiliary electronic expansion valve based on the economizer parameter and the exhaust parameter comprises:
comparing the exhaust parameter with a target exhaust parameter when the economizer parameter reaches the initial target economizer parameter;
when the exhaust parameter is not higher than the target exhaust parameter, keeping the opening degree of the main electronic expansion valve unchanged, and adjusting the opening degree of the auxiliary electronic expansion valve according to the economizer parameter and the initial target economizer parameter;
and when the exhaust parameter is higher than the target exhaust parameter, increasing the initial target suction superheat degree to obtain an increased target suction superheat degree, adjusting the opening degree of the main electronic expansion valve according to the suction superheat degree and the increased target suction superheat degree, and adjusting the opening degree of the auxiliary electronic expansion valve according to the economizer parameter and the initial target economizer parameter.
5. The heat pump unit control method of claim 3, wherein adjusting the opening of the main electronic expansion valve and the opening of the auxiliary electronic expansion valve based on the economizer parameter and the exhaust parameter comprises:
when the degree of superheat of the economizer is lower than the initial target degree of superheat of the economizer, comparing the exhaust gas parameter with a target exhaust gas parameter;
when the exhaust parameter reaches the target exhaust parameter, keeping the opening degree of the main electronic expansion valve and the opening degree of the auxiliary electronic expansion valve unchanged;
when the exhaust parameter is higher than the target exhaust parameter, increasing the initial target suction superheat degree to obtain an increased target suction superheat degree, and adjusting the opening degree of the main electronic expansion valve according to the suction superheat degree and the increased target suction superheat degree; simultaneously reducing the superheat degree of the initial target economizer to obtain the reduced superheat degree of the target economizer, and adjusting the opening degree of the auxiliary electronic expansion valve according to the superheat degree of the economizer and the reduced superheat degree of the target economizer;
when the exhaust parameter is lower than the target exhaust parameter, keeping the opening degree of the main electronic expansion valve unchanged, simultaneously increasing the superheat degree of the initial target economizer to obtain the increased superheat degree of the target economizer, and adjusting the opening degree of the auxiliary electronic expansion valve according to the superheat degree of the economizer and the increased superheat degree of the target economizer;
comparing the exhaust parameter with the target exhaust parameter when the economizer supercooling degree is higher than the initial target economizer supercooling degree;
when the exhaust parameter reaches the target exhaust parameter, keeping the opening degree of the main electronic expansion valve and the opening degree of the auxiliary electronic expansion valve unchanged;
when the exhaust parameter is higher than the target exhaust parameter, adjusting the opening degree of the main electronic expansion valve according to the suction superheat degree and the increased target suction superheat degree; simultaneously increasing the supercooling degree of the initial target economizer to obtain the supercooling degree of the increased target economizer, and adjusting the opening degree of the auxiliary electronic expansion valve according to the supercooling degree of the economizer and the supercooling degree of the increased target economizer;
and when the exhaust parameter is lower than the target exhaust parameter, keeping the opening degree of the main electronic expansion valve unchanged, simultaneously reducing the supercooling degree of the initial target economizer to obtain the reduced supercooling degree of the target economizer, and adjusting the opening degree of the auxiliary electronic expansion valve according to the supercooling degree of the economizer and the reduced supercooling degree of the target economizer.
6. The heat pump unit control method of claim 3, wherein adjusting the opening of the main electronic expansion valve and the opening of the auxiliary electronic expansion valve based on the economizer parameter and the exhaust parameter comprises:
when the economizer superheat degree is higher than the initial target economizer superheat degree, increasing the initial target suction superheat degree to obtain an increased target suction superheat degree, and adjusting the opening degree of the main electronic expansion valve according to the suction superheat degree and the increased target suction superheat degree; reducing the superheat degree of the initial target economizer to obtain a reduced superheat degree of the target economizer, and adjusting the opening degree of the auxiliary electronic expansion valve according to the superheat degree of the economizer and the reduced superheat degree of the target economizer;
when the supercooling degree of the economizer is lower than the supercooling degree of the initial target economizer, increasing the initial target air suction superheat degree to obtain an increased target air suction superheat degree, and adjusting the opening degree of the main electronic expansion valve according to the air suction superheat degree and the increased target air suction superheat degree; and increasing the supercooling degree of the initial target economizer to obtain the increased supercooling degree of the target economizer, and adjusting the opening degree of the auxiliary electronic expansion valve according to the supercooling degree of the economizer and the increased supercooling degree of the target economizer.
7. The heat pump unit control method according to any one of claims 1 to 6, characterized in that the method further comprises:
before the first control process and the second control process are executed, the opening degree of the main electronic expansion valve is adjusted to an initial main valve opening degree, and the opening degree of the auxiliary electronic expansion valve is adjusted to an initial auxiliary valve opening degree.
8. The heat pump unit control method according to claim 7, characterized in that the method further comprises:
and in the first control process, keeping the opening degree of the auxiliary electronic expansion valve as the initial auxiliary valve opening degree.
9. A heat pump unit control apparatus, the apparatus comprising:
an intake superheat degree acquisition unit for acquiring an intake superheat degree;
the economizer parameter acquisition unit is used for acquiring economizer parameters; the economizer parameter is the superheat degree of the economizer or the supercooling degree of the economizer;
the exhaust parameter acquisition unit is used for acquiring an exhaust parameter; the exhaust parameter is exhaust superheat degree or exhaust temperature;
an intake superheat degree determination unit for determining whether the intake superheat degree reaches an initial target intake superheat degree;
a first processing unit configured to execute a first control process when the degree of suction superheat does not reach the initial target degree of suction superheat: adjusting the opening degree of the main electronic expansion valve according to the suction superheat degree and the initial target suction superheat degree;
a second processing unit for executing a second control process when the intake superheat reaches the initial target intake superheat: and adjusting the opening degree of the main electronic expansion valve and the opening degree of the auxiliary electronic expansion valve based on the economizer parameter and the exhaust parameter.
10. A heat pump unit comprising a processor, a memory and a computer program stored on the memory, wherein the processor is configured to execute the computer program to implement the heat pump unit control method of any one of claims 1 to 8.
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